Diesel particulate filters (DPFs) are a technology likely to be deployed to meet future stringent emission levels for heavy and light duty diesel powertrains in North America and Europe. This paper discusses experimental results in the active regeneration of DPFs. First we discuss how to assess the DPF state so as to arrive at a regeneration decision. Then we descuss how the exhaust gas temperature can be raised so as to achieve regeneration. Attention is given to the system components, the information based on which regeneration is triggered, and the means to achieve a regeneration. The paper reports on successful regenerations under several extreme conditions. In one experiment, the DPF regeneration was initiated and then aborted by turning off the engine. The engine was turned on again after 3 minutes, resulting in a substantial latent heat wave passing by the post-DPF temperature sensor. The regeneration completes without damage to the DPF. Regenerating under cold ambient temperatures driving at high vehicle speeds was found to be a challenge. It was found necessary to use a double walled DPF canister to retain the heat inside the system, and to allow dependence of various limits and setpoints on ambient air temperature. Regeneration frequency and fuel penalty increase under these extreme conditions. In conclusion, we have gained confidence that an active regeneration strategy for a catalyzed diesel particulate filter can be made to operate reliably under a variety of extreme driving conditions.
Experiments in active diesel particulate filter regeneration
2003
8 Seiten, 6 Bilder, 8 Quellen
Conference paper
English
Experiments in Active Diesel Particulate Filter Regeneration
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